<template>
    <div class="todo-header">
        <input type="text" placeholder="请输入你的任务名称，按回车键确认" v-model="title" @keyup.enter="add"/>
    </div>
</template>

<script>
    import {nanoid} from 'nanoid'
    export default {
        name: 'MyHeader',
        props:['addTodo'],
        data(){
            return {
                title: ''
            }
        },
        methods: {
            add(){
                //校验数据
                if(!this.title.trim()) return alert('输入不能为空！')
                //将用户的输入包装成一个todo对象
                const todoObj = {id: nanoid(), title: this.title, done:false}
                //通知App组件去添加一个todo对象
                this.$emit('addTodo', todoObj)
                //清空输入
                this.title = ''
            }
            /* add(){
                console.log(this.title);
            } */

        }
    }
</script>

<style scoped>
    /*header*/
    .todo-header input {
        width: 560px;
        height: 28px;
        font-size: 14px;
        border: 1px solid #ccc;
        border-radius: 4px;
        padding: 4px 7px;
        }

    .todo-header input:focus {
        outline: none;
        border-color: rgba(82, 168, 236, 0.8);
        box-shadow: inset 0 1px 1px rgba(0, 0, 0, 0.075), 0 0 8px rgba(82, 168, 236, 0.6);
        }
</style>